An engine cylinder head air passage sand core positioning structure

Abstract

An engine cylinder head air channel sand core positioning structure, comprising a bottom die, a side die and an air channel sand core, the side die is arranged above the bottom die, the air channel sand core is installed in the gap between the bottom die and the side die, a positioning device is arranged at the pressing point of the air channel sand core and the side die, the positioning device comprises a pressing inclined surface arranged at the upper end of the air channel sand core and a positioning mechanism arranged in a stepped hole of the side die, the positioning mechanism comprises a pressing pin arranged at the bottom of the stepped hole, the bottom of the pressing pin abuts against the pressing point, a heat-resistant spring is arranged above the pressing pin, an adjusting bolt is arranged at the upper end of the heat-resistant spring, the pressing force of the heat-resistant spring is adjusted by adjusting the adjusting bolt, and the purpose of pressing the air channel sand core is achieved. The positioning structure is simple in structure and higher in precision of the processed product.

Description

Technical Field

[0001] This utility model relates to the field of motorcycle engine manufacturing technology, specifically to an engine cylinder head air passage sand core positioning structure. Background Technology

[0002] The combustion chamber and intake manifold are the most critical parts of the cylinder head, and their dimensions require extremely high precision. In the actual production process of the cylinder head, the intake manifold is formed using a sand core, and the positioning accuracy of the sand core significantly affects the manifold's position and dimensions. In traditional designs, to prevent damage to the intake manifold and subsequent sand shedding, a gap needs to be left between the intake manifold clamping point and the side mold clamping point. Therefore, the position and dimensions of the intake manifold are often difficult to control precisely. Cylinder heads produced using this type of mold exhibit significant fluctuations in the position and dimensions of the intake manifold. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a sand core positioning structure for engine cylinder head intake ports. This positioning structure is simple in design and produces products with higher dimensional accuracy.

[0004] The purpose of this utility model is achieved by the following solution: a positioning structure for an engine cylinder head air passage sand core, including a bottom mold, a side mold, and an air passage sand core. The side mold is set above the bottom mold, and the air passage sand core is installed in the gap between the bottom mold and the side mold. A positioning device is set at the pressing point of the air passage sand core and the side mold. The positioning device includes a pressing inclined surface set at the upper end of the air passage sand core and a positioning mechanism set in a stepped hole on the side mold. The positioning mechanism includes a pressing pin set at the bottom of the stepped hole. The bottom of the pressing pin abuts against the pressing point. A heat-resistant spring is set above the pressing pin. An adjusting bolt is set at the upper end of the heat-resistant spring. The preload of the heat-resistant spring is adjusted by adjusting the adjusting bolt to achieve the purpose of pressing the air passage sand core.

[0005] The lower end of the clamping pin has a ball head structure.

[0006] The inclined surface at the front end of the air passage sand core abuts against the bottom mold, and there is a 0.15mm gap between the side of the front end and the bottom mold, and a 0.3mm gap between the bottom surface of the front end and the bottom mold.

[0007] The bottom positioning post of the air passage sand core has a 0.3mm gap between its left side and the bottom mold, its right side abuts against the bottom mold, its side surface has a 0.1mm gap with the bottom mold, and its bottom surface has a 0.5mm gap with the bottom mold.

[0008] The air passage sand core has a gap of at least 0.5 mm between its rear end and the bottom mold and the side mold.

[0009] The gap between the top plane of the air passage sand core and the side mold is 0.3mm.

[0010] The clamping point of the clamping pin is located between the contact point between the inclined surface of the front end of the air passage sand core and the bottom mold, and between the right side of the bottom positioning post and the bottom mold.

[0011] The advantage of this invention is that, by adjusting the positioning mechanism to press the sand core, the position and size of the air passage are well controlled, resulting in high positioning accuracy and stable quality of the produced cylinder head air passage. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the airway sand core structure; Figure 3 This is a schematic diagram of the structure of the present utility model. Figure 2 ; Figure 4 This is an enlarged schematic diagram of the structure at point A; Figure 5 This is an enlarged schematic diagram of the structure at point B; Figure 6 This is an enlarged schematic diagram of the structure at point C. Detailed Implementation

[0013] like Figures 1 to 6 As shown, an engine cylinder head intake manifold positioning structure includes a bottom mold 1, a side mold 3, and an intake manifold sand core 2. The side mold 3 is positioned above the bottom mold 1, and the intake manifold sand core 2 is installed in the gap between the bottom mold 1 and the side mold 3 to ensure positioning stability. A positioning device is provided at the pressing point between the intake manifold sand core 2 and the side mold 3. The positioning device includes a pressing inclined surface 8 at the upper end of the intake manifold sand core 2 and a positioning mechanism in a stepped hole 7 on the side mold 3. The positioning mechanism includes a pressing pin 4 at the bottom of the stepped hole 7, with the bottom of the pressing pin 4 abutting against the pressing point. The lower end of the pressing pin 4 has a ball head structure. A heat-resistant spring 5 is positioned above the pressing pin 4, and an adjusting bolt 6 is positioned at the upper end of the heat-resistant spring 5. The preload of the heat-resistant spring 5 is adjusted by adjusting the adjusting bolt 6 to achieve the purpose of pressing the intake manifold sand core 2.

[0014] The inclined surface A1 of the front end A of the air passage sand core 2 abuts against the bottom mold 1. A 0.15mm gap exists between the side surface A2 of the front end A and the bottom mold 1, and a 0.3mm gap exists between the bottom surface A3 of the front end A and the bottom mold 1. The left side surface B1 of the bottom positioning post B of the air passage sand core 2 has a 0.3mm gap with the bottom mold 1, the right side surface B2 of the bottom positioning post B abuts against the bottom mold 1, the side surface B3 of the bottom positioning post B has a 0.1mm gap with the bottom mold 1, and the bottom surface B4 of the bottom positioning post B has a 0.5mm gap with the bottom mold 1. The rear end C of the air passage sand core 2 has a gap of at least 0.5mm between it and both the bottom mold 1 and the side mold 3. The gap between the top surface of the air passage sand core 2 and the side mold 3 is 0.3mm. The clamping point of the clamping pin 4 is located between the inclined surface A1 of the front end A of the air passage sand core 2 and the right side surface B2 of the bottom positioning post B. The gaps between the air passage sand core 2 and the bottom mold 1 and the side mold 3 at various points can ensure that the air passage sand core 2 will not interfere with the bottom mold 1 and the side mold 3, and prevent the aluminum liquid from entering.

[0015] Assembly process of positioning structure: 1. Make a clamping slope 8 on the upper part of the air passage sand core 2; 2. Install the positioning mechanism in the stepped hole 7 of the side mold, and put in the clamping pin 4, heat-resistant spring 5 and adjusting bolt 6 in sequence; 3. When the side mold is closed from right to left, the ball head of the front end of the clamping pin 4 contacts the clamping inclined surface 8. After clamping, there is no gap, thus achieving the purpose of clamping the sand core.

[0016] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications made to the present utility model by those skilled in the art without departing from the spirit of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A positioning structure for a cylinder head intake manifold, comprising a bottom mold (1), a side mold (3), and an intake manifold sand core (2), wherein the side mold (3) is disposed above the bottom mold (1), and the intake manifold sand core (2) is installed in the gap between the bottom mold (1) and the side mold (3), characterized in that: A positioning device is provided at the pressing point between the air passage sand core (2) and the side mold (3). The positioning device includes a pressing inclined surface (8) provided at the upper end of the air passage sand core (2) and a positioning mechanism provided in the stepped hole (7) on the side mold (3). The positioning mechanism includes a pressing pin (4) provided at the bottom of the stepped hole (7). The bottom of the pressing pin (4) abuts against the pressing point. A heat-resistant spring (5) is provided above the pressing pin (4). An adjusting bolt (6) is provided at the upper end of the heat-resistant spring (5). The preload of the heat-resistant spring (5) is adjusted by adjusting the adjusting bolt (6) to achieve the purpose of pressing the air passage sand core (2).

2. The engine cylinder head intake port sand core positioning structure according to claim 1, characterized in that: The lower end of the clamping pin (4) has a ball head structure.

3. The engine cylinder head intake port sand core positioning structure according to claim 1, characterized in that: The inclined surface (A1) of the front end (A) of the air passage sand core (2) abuts against the bottom mold (1), the side surface (A2) of the front end (A) and the bottom mold (1) are provided with a gap of 0.15mm, and the bottom surface (A3) of the front end (A) and the bottom mold (1) are provided with a gap of 0.3mm.

4. The engine cylinder head intake port sand core positioning structure according to claim 1, characterized in that: The bottom positioning post (B) of the air passage sand core (2) has a 0.3mm gap between its left side (B1) and bottom mold (1), its right side (B2) abuts against the bottom mold (1), its side side (B3) has a 0.1mm gap with the bottom mold (1), and its bottom surface (B4) has a 0.5mm gap with the bottom mold (1).

5. The engine cylinder head intake port sand core positioning structure according to claim 1, characterized in that: The rear end (C) of the air passage sand core (2) is provided with a gap of at least 0.5 mm between the bottom mold (1) and the side mold (3).

6. The engine cylinder head intake port sand core positioning structure according to claim 1, characterized in that: The gap between the top plane of the air passage sand core (2) and the side mold (3) is 0.3 mm.

7. The engine cylinder head intake port sand core positioning structure according to claim 1, characterized in that: The clamping point of the clamping pin (4) is located between the inclined surface (A1) of the front end (A) of the air passage sand core (2) and the right side surface (B2) of the bottom positioning post (B).

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